I built this antenna about 10yrs ago,from "The Ground Up" I used 3/4" aluminum plate,aluminum 3/16" welding/brazing rods,a LOT of stainless steel set screws,a piece of 3/4" plastic for the insulator/counterpoise.I even made the mount.The tube,is made out of aluminum conduit.Very 'labor intense',but the reward was well worth it!! I used the dimensions from a Radio Shack discone,and,went from there.This is a 16 element discone.Double the surface area than the Radio Shack discone.This thing works awesome!!!
Still my 'favorite homebrew' Military/Commercial Airband is LOUD and Clear.
Also,it held up great during our Ice Storm of 2006!!